/*
 * Copyright 2011-2013 HTTL Team.
 *  
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *  
 *      http://www.apache.org/licenses/LICENSE-2.0
 *  
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package httl;

import java.io.IOException;
import java.text.ParseException;
import java.util.List;

/**
 * Node. (API, Prototype, Immutable, ThreadSafe)
 *
 * @author @author Liang Fei (liangfei0201 AT gmail DOT com)
 * @see httl.Template
 */
public interface Node {

    /**
     * Accept a visitor.
     *
     * @param visitor
     * @throws IOException    - If an I/O error occurs
     * @throws ParseException - If the expression cannot be parsed on runtime
     */
    void accept(Visitor visitor) throws IOException, ParseException;

    /**
     * Get the node offset.
     *
     * @return offset
     */
    int getOffset();

    /**
     * Get the parent node.
     *
     * @return parent
     */
    Node getParent();

    /**
     * Get the template children nodes.
     *
     * @return children nodes
     */
    List<Node> getChildren();

}